Physical and mechanical response of large-diameter shield tunnel lining structure under non-uniform fire: A full-scale fire test-based study

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
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Abstract

When a fire occurs in an underground shield tunnel, it can result in substantial property damage and cause permanent harm to the tunnel lining structure. This is especially true for large-diameter shield tunnels that have numerous segments and joints, and are exposed to specific fire conditions in certain areas. This paper constructs a full-scale shield tunnel fire test platform and conducts a non-uniform fire test using the lining system of a three-ring large-diameter shield tunnel with an inner diameter of 10.5 m. Based on the tests, the temperature field distribution, high-temperature bursting, cracking phenomena, and deformation under fire conditions are observed. Furthermore, the post-fire damage forms of tunnel lining structures are obtained through the post-fire ultimate loading test, and the corresponding mechanism is explained. The test results illustrate that the radial and circumferential distribution of internal temperature within the tunnel lining, as well as the radial temperature gradient distribution on the inner surface of the lining, have non-uniform distribution characteristics. As a result, the macroscopic phenomena of lining concrete bursting and crack development during the fire test mainly occur near the fire source, where the temperature rise gradient is the highest. In addition, the lining structure has a deformation characteristic of local outward expansion and cannot recover after the fire load is removed. The ultimate form of damage after the fire is dominated by crush damage from the inside out of the lining joints in the fire-exposed area. The above results serve as a foundation for future tunnel fire safety design and evaluation.

大直径盾构隧道衬砌结构在非均匀火灾下的物理和机械响应:基于全尺寸火灾试验的研究
当地下盾构隧道发生火灾时,可能会造成巨大的财产损失,并对隧道衬砌结构造成永久性伤害。尤其是对于拥有众多分段和接缝,并在某些区域暴露于特定火灾条件下的大直径盾构隧道而言,更是如此。本文构建了一个全尺寸盾构隧道火灾试验平台,并利用内径为 10.5 米的三环大直径盾构隧道的衬砌系统进行了非均匀火灾试验。根据试验,观察了火灾条件下的温度场分布、高温爆裂、开裂现象和变形。此外,还通过火灾后极限加载试验获得了隧道衬砌结构的火灾后破坏形式,并解释了相应的机理。试验结果表明,隧道衬砌内部温度的径向和圆周分布以及衬砌内表面的径向温度梯度分布具有非均匀分布特征。因此,在火灾试验中,衬砌混凝土爆裂和裂缝发展的宏观现象主要发生在温度上升梯度最大的火源附近。此外,衬砌结构具有局部向外膨胀的变形特征,在火灾荷载卸除后无法恢复。火灾后的最终破坏形式主要是火灾暴露区域内衬接缝处由内向外的挤压破坏。上述结果为今后的隧道防火设计和评估奠定了基础。
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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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